#include <bits/stdc++.h>

using namespace std;



int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int t;
    while(t--)
    {
        long long sum=0;
        int a,b,c,d,e,f;
        cin >> a >> b >> c >> d >> e >> f;
        if(e>f)
        {
            sum=sum+e*min(a,d);
            d=d-min(a,d);
            sum=sum+f*min(min(b,c),d);
        }
        if(e<f)
        {
            sum=sum+f*min(min(b,c),d);
            d=d-min((b,c),d);
            sum=sum+e*min(a,d);
        }
        if(e==f)
        {
            if(a>=min(b,c))
            {
                sum=sum+f*min(min(b,c),d);
                d=d-min(min(b,c),d);
                sum=sum+e*min(a,d);
            }
            else
            {
                sum=sum+e*min(a,d);
                d=d-min(a,d);
                sum=sum+f*min(min(b,c),d);
            }
        }
        cout << sum;
        return 0;

    }
}